Pouch Film for Secondary Battery and Manufacturing Method Thereof
AssigneeLG Energy Solution, Ltd.
InventorYong Kim
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Abstract
A pouch film for a secondary battery and a method for manufacturing the same. In some embodiments, the pouch film includes a stretchable auxiliary layer that is a multi-layered structure comprising a plurality of layers, wherein layers in the plurality of layers have different elongation rates. The stress at the interface of each layer is relieved and the moldability of a pouch is improved. The risk of breakage of a pouch is significantly reduced and defect rates are reduced in a pouch manufacturing process, thereby reducing manufacturing costs.
Claims10
A pouch film for a secondary battery for manufacturing a pouch-type battery case, the pouch film comprising:
- a sealant layer formed as the innermost layer;
- a surface protection layer formed as the outermost layer;
- a gas barrier layer laminated between the sealant layer and the surface protection layer;
- and
- a stretchable auxiliary layer laminated between the gas barrier layer and the surface protection layer, wherein the stretchable auxiliary layer is a multi-layered structure comprising a plurality of layers, wherein layers in the plurality of layers have different elongation rates.
A method for manufacturing a pouch film for a secondary battery, the method comprising:
- laminating a gas barrier layer on a sealant layer;
- laminating a stretchable auxiliary layer on the gas barrier layer, wherein the stretchable auxiliary layer is a multi-layered structure comprising a plurality of layers, where layers in the plurality have different elongation rates;
- and
- laminating a protection layer on the stretchable auxiliary layer, such that the sealant layer, gas barrier layer, stretchable auxiliary layer, and protection layer are sequentially arranged.
Dependencies are inferred from the claim text.